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6
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the
frequency stated in the table. These procedures should also be
a part of any seasonal tune-up.
NOTE: Some maintenance procedures may require special
tools or skills. If you are unsure about these procedures
take your unit to any non-road engine repair
establishment, individual or authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission
control devices and system may be performed by any non-
road engine repair establishment, individual or authorized
service dealer.
WARNING: To prevent serious injury, never
perform maintenance or repairs with unit running.
Always service and repair a cool unit. Disconnect the
spark plug wire to ensure that the unit cannot start.
FREQUENCY MAINTENANCE REQUIRED SEE
Before starting engine
Fill fuel tank with fresh fuel
Check oil
p. 4
p. 8
Every 10 hours Clean and re-oil air filter p. 9
1
st
change at 10 hours
2
nd
change at 25 hours
Every 25 hours after
Change oil
Change oil
Clean spark arrestor
p. 9
p. 9
p. 12
10 hours on new
engine
Every 25 hours
Every 25 hours
Check rocker arm to valve
clearance and adjust
Check rocker arm to valve
clearance and adjust
Check spark plug
condition and gap
p. 10
p. 10
p. 11
HOLDING THE TRIMMER
Before operating the unit, stand in the operating position (Fig.
10). Check for the following:
• The operator is wearing eye
protection and proper clothing
• With a slightly-bent right arm, the
operator’s right hand is holding the
shaft grip
• The operator’s left arm is straight,
the left hand holding the assist
handle
• The unit is at waist level
• The cutting attachment is parallel to
the ground and easily contacts the
grass without the need to bend over
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting attachment allows you to release
trimming line without stopping the engine. To release more line,
lightly tap the cutting attachment on the ground (Fig. 11) while
operating the trimmer at high speed.
NOTE: Always keep the
trimming line fully
extended. Line release
becomes more
difficult as the cutting
line becomes shorter.
Each time the head is
bumped, about 1 inch
(25.4 mm) of trimming
line is released. A blade
in the cutting attachment shield will cut the line to the proper
length if excess line is released.
For best results, tap the Bump Head™ on bare ground or hard
soil. If line release is attempted in tall grass, the engine may
stall. Always keep the trimming line fully extended. Line release
becomes more difficult as the cutting line becomes shorter.
NOTE: Do not rest the Bump Head™ on the ground while the
unit is running.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• For best trimming results, operate unit at full throttle.
• Keep the cutting attachment parallel to the ground.
• Do not force the cutting attachment. Allow the tip of the line to do
the cutting, especially along walls. Cutting with more than the tip
will reduce cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom
in small increments to avoid premature line wear or engine drag.
• Cutting from right to left improves the unit's cutting efficiency.
Clippings are thrown away from the operator.
• Slowly move the trimmer into and out of the cutting area at the
desired height. Move either in a forward-backward or side-to-
side motion. Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon proper
adherence of explained trimming techniques, what
vegetation is cut, and where vegetation is cut.
For example, the line will wear faster when trimming against a
foundation wall as opposed to trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is
accomplished by removing all
vegetation around trees, posts,
fences and more.
Rotate the whole unit so that the
cutting attachment is at a 30°
angle to the ground (Fig. 12).
OPERATING INSTRUCTIONS
WARNING: Do not remove or alter the line cutting
blade assembly. Excessive line length will make the
clutch overheat. This may lead to serious personal
injury or damage to the unit.
WARNING: Always wear eye, hearing, foot and
body protection to reduce the risk of injury when
operating this unit.
Fig. 10
Fig. 12
Fig. 11
MAINTENANCE AND REPAIR INSTRUCTIONS